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Hey guys so I have 2000 z28 with a 6.0 lq4 bored .30 with speedpro flat tops and prc 2.5 ls6 heads that were milled .20 and fic #42lb injectors and running a 235/242 111lsa cam with +2 advance (similar to btr stage 4) I recently swapped my ls6 intake for a fast 92, took the car to the dyno and was a little less than pleased, last time I dynoed in May I made 467whp at 6750rpm and 455tq at 4310rpm with the ls6. Today it dynoed 454whp at 6750 and 513tq at 4310rpm
Fuel and air were dead on and tried adding timing but didn’t change anything, I’m just confused cause I thought the fast would be at least a couple horsepower over the ls6 not lose 10-12....the only positive was gaining all that torque on the low end. My tuner said more that likely my drag radials I put on ( had firestone Indy 500’s at the first session) are robbing some horsepower as well as it being a little warmer than when we tuned in May, also he said that my exhaust could be a choking point as well (y pipe into center mount exit) should I be upset or would you guys be happy with the results?
Don't think you lost power by the dyno numbers being lower than the last time. Do you have any pics of either graphs? Did you put a 92mm TB on & what's your induction set up?
The ideas you were given sound wise to me. Drag radials can eat up some power numbers along with the weather differences.
Don't think you lost power by the dyno numbers being lower than the last time. Do you have any pics of either graphs? Did you put a 92mm TB on & what's your induction set up?
The ideas you were given sound wise to me. Drag radials can eat up some power numbers along with the weather differences.
I can post the graphs when I get home, yes I used a speed engineering 92mm throttle body with an 85mm truck maf and ftp 98mm lid
I can post the graphs when I get home, yes I used a speed engineering 92mm throttle body with an 85mm truck maf and ftp 98mm lid
Cool. Sounds good. I would bet your car makes a bit more power with the fast92 over the ls6. Try not to get hung on those lower numbers. Similar things have happened to many others.. including myself.
I dont think your intake is suspect. I think your dyno session is suspect. That tq number seems quite odd. 58 ft lbs from an intake swap doesnt raise a red flag? I think there was some settings/info/parameters inputted wrong to the dyno and its skewed...........
Take it out and see if you have an ET improvement. It could be as simple as the calibration of two diff dynos, or weather changes between time frames on the same dyno.
Take it out and see if you have an ET improvement. It could be as simple as the calibration of two diff dynos, or weather changes between time frames on the same dyno.
Im thinking weather and tires played a part because it was same dyno
I dont think your intake is suspect. I think your dyno session is suspect. That tq number seems quite odd. 58 ft lbs from an intake swap doesnt raise a red flag? I think there was some settings/info/parameters inputted wrong to the dyno and its skewed...........
Alright so first photo was the two sheets he gave me from the first dyno run, the top sheet was hp bottom was the tq, second photo you can see where the tq was over 500 at a little over 3000 so I misspoke earlier. He showed me on the computer that it peaked at 513 for tq.
So shouldn’t be to worried that it lost some top end? And tq increase seems ok..?
Yea, I wouldn't be too worried man. Just the dyno numbers. Bet the engine is more happy with the better intake setup & actually makes more power. The tq increase is just from the converter being unlocked & at lower rpm. Normal.
Good upgrade man. You made a good choice on intake setup. In my opinion.
Yea, I wouldn't be too worried man. Just the dyno numbers. Bet the engine is more happy with the better intake setup & actually makes more power. The tq increase is just from the converter being unlocked & at lower rpm. Normal.
Good upgrade man. You made a good choice on intake setup. In my opinion.
Thank you for the reassurance lol, I can say though that the butt dyno can feel a HUGE difference off the line no doubt about it so I’m gonna run some track times and that will be my deciding factor on Weather it was worth it
Honestly I’m not a fast fan boy but I’ve never seen one lose power over a stock intake except for the ls3.
My tuner was also not a fan of the fast he told me not to switch lol but I figured the ls6 was starting to become the restriction on my motor and wanted to maximize as much as possible, I’m honestly thinking of spraying at least 100-150 shot of nitrous and get it to where I want it
My tuner was also not a fan of the fast he told me not to switch lol but I figured the ls6 was starting to become the restriction on my motor and wanted to maximize as much as possible, I’m honestly thinking of spraying at least 100-150 shot of nitrous and get it to where I want it
Its not that I diont like them or think they arent a good intake, they are. I just dont agree with $900 for a chunk of plastic that the nutserts fall out of.
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Replaced ls6 with fast 92 made less power 
